The lower section of the board includes cards for each user on the team:

The color bar at the top of a user's card is based on the user's role, as defined in their profile. Learn more.

The card background is white if the person is part of the team, and gray if they are not part of the team but they are the owner of tasks in the selected iteration.

Modify Team Member Board Settings

To modify the app settings:

From the app gear menu, select Settings.

You can set the board to change its data with your global project picker, or you can choose a specific project or group of projects to work from. If you select Follow Global Project Setting, the contents of the board will change according to your global project picker. Select Choose Specific Project if you want to see another project's work, regardless of your global project setting.

Teams - Select one or more teams to display, each in their own column on the board.